Abdomen exerciser



FIG. 1 is a perspective view showing the new design for an embodiment of an abdomen developing exerciser machine;

FIG. 2 is a front view thereof;

FIG. 3 is rear view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines appearing in FIG. 7 depict portions of the abdominal exerciser in which the design is embodied that are not considered part of the claimed design. 

CLAIM The ornamental design for an abdomen exerciser, as shown and described. 